My 10 year old Sprinter has been fine. But with 28k miles it's not even broke in yet. I would not automatically jump on a new Sprinter, just because it's a Sprinter. I am as opinionated as anyone when it comes to vehicles, many miles of driving and racing. Before I bought my van, I researched the Sprinter T1N and found they had been in production for years all over the world. I wanted a turbo diesel, and 10 years ago the only one that was easy to get was a Sprinter.
Today, I would wait to see a Ford Transit, and look real hard at the Ecoboost gas engine. The emissions on new diesels is cost prohibitive, the turbo on a gas engine will do almost the same job and with a lot less emission junk. I have zero interest in the Dodge Promaster, FWD and Fiat, make that decision for me. Bad experiences with both.